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This arc was mis-defined in IETF RFC 1274, section 7, because the authors originally believed "data" was a CCITT assignment for data networks. It was officialized in the 2011 edition of Rec. ITU-T X.660 | ISO/IEC 9834-1 but clause A.3.9 states that "No other arcs are assigned below [this] arc except {itu-t(0) data(9) pss(2342) ucl(19200300)} which is used in conjunction with "The Co-operation and Open Systems IntercoNnection in Europe (COSINE) and Internet X.500 Schema").
Note from David Chadwick: The University College of London, which engineered the Directory implementation known as Quipu (Robbins and Kille, 1991; Kille, 1989), did not have an OID allocated to it as an organization way back in 1988. It was likely to be several years before there would be a national or international mechanism for obtaining one. During the course of the implementation, the software producers found that it was necessary to define new object classes and attribute types that did not exist in the Standard. But these definitions required the allocation of object identifiers, which they did not have. However, the authors were resourceful enough to realize that their 12 digit Rec. ITU-T X.25 Packet Switch Stream number (234219200300) was globally unique. 2342 was the Data Network Identification Code (DNIC) for British Telecom's Packet Switch Stream (PSS), and 19200300 was the Private Network Identification Code (PNIC) for University College London (UCL). UCL could allocate a two digit local qualifier (they chose 99) to uniquely identify the Quipu implementation attached to that PSS port. But how could this be converted into an OID? Steve Kille spoke to an employee from a UK telecom's company, who suggested that arc 9 under CCITT could safely be used for private data, since it was unlikely that CCITT would ever use it. This produced an OID of 0.9.2342.19200300.99 for the Quipu implementation. UCL then allocated OIDs to all their newly defined Quipu objects, based upon this stub. Now most of the Digital Signature Algorithms (DSAs) in existence are happily passing around UCL's PSS number as a valid component of the object identifiers that they use every day. In fact the OID [was] completely illegal, since arc 9 under CCITT [did] not officially exist!
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itu-t(0)
pss(2342) 
